OsAGSW1, an ABC1-like kinase gene, is involved in the regulation of grain size and weight in rice

文献类型： 外文期刊

第一作者： Li, Tao

作者： Li, Tao;Jiang, Jieming;Zhang, Shengchun;Shu, Haoran;Wang, Yaqin;Lai, Jianbin;Du, Jinju;Yang, Chengwei;Li, Tao

作者机构：

关键词： ABC1-like kinase;grain development;grain size;grain weight;grain width;OsAGSW1

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

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收录情况： SCI

摘要： OsAGSW1 controlled seed shape and size by regulating the number of external parenchyma cells of the hulls and the development of vascular bundles.Grain shape and weight are two determining agronomic traits of rice yield. ABC1 (Activity of bc1 complex) is a newly found atypical kinase in plants. Here, we report on an ABC1 protein kinase gene,OsAGSW1 (ABC1-like kinase related to Grain size and Weight). Expression of OsAGSW1-GFP in rice revealed that OsAGSW1 is localized to the chloroplasts in rice. Analysis ofOsAGSW1 promoter::beta-glucuronidase transgenic rice indicated that this gene was highly expressed in vascular bundles in shoot, hull and caryopsis. Furthermore,OsAGSW1-RNAi and overexpressed transgenic rice lines were generated. Stable transgenic lines overexpressingOsAGSW1 exhibited a phenotype with a significant increase in grain size, grain weight, grain filling rate and 1000-grain weight compared with the wild-type and RNAi transgenic plants. Microscopy analysis showed that spikelet hulls just before heading were different in theOsAGSW1-overexpressed plants compared with wild-type andOsAGSW1 RNAi rice. Further cytological analysis showed that the number of external parenchyma cells in rice hulls ofOsAGSW1-overexpressed plants increased, leading to wider and longer spikelet hulls than those of the wild-type andOsAGSW1-RNAi plants. The vascular cross-sectional area in lemma, carpopodium and ovules also strikingly increased and area of both xylem and phloem were enlarged in theOsAGSW1-overexpressed plants. Thus, our results demonstrated thatOsAGSW1 plays an important role in seed shape and size of rice by regulating the number of external parenchyma cells and the development of vascular bundles, providing a new insight into the functions ofABC1 genes in plants.

分类号： Q94

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